Sewing machine



Nov.- 9 '1926.

J. KlEwlcz SEWING MACHINE Fild Jung 1s. 192e s sheets-she't 1 J, KIEWICZ SEWING MACHINE y 3 sheets-sheet Filed Jun@ v16, 1926 lnve'nToT. John' K evvc:

Patented Nov.. 9, 1926.

narran stares asien.

Joran KIiuwICz, or BOSTON, MASSACHUsnTTs,A ASSIGNOR To THE annee BUTTON HornrJ MACHINE COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION or MAINE.

SEWING MACHINE.

Application filed June 16, 1926. Serial No. 116,285.

This invention relates to sewing machines of that known type which are constructed with a needle operating to penetrate the work from above and two loopers and loopspreading means situated beneath the work let, are provided with a turret on which thev loopers and loop spreaders are mounted, the

HJturret being constructed to turn in Order to carry'the stitching around the ends of the buttonhole or around the eyelet. As illustrating a sewing machine of this type reierence may Patents No. 862,288, August 6th, 1907 and No. 911,551, February 2nd, 1909. In this type of sewing machine the loopers are usually given a more or less irregular oscillatory movement and the present invention relates to ar novel means for producing such an oscillating movement of the loopers,

which means is conductive to high speed` cam device to the looper and loop spreaders and as these connections are relatively light they can be given the desired irregular motion at a speed without producing any undesirable jar or vibration.

invention I have illustrated in the drawings a selected 'embodiment thereof 'which will now be described after which the novel features will be pointed out in the appended claims.

Fig. 1 is a side View of a sewing machine embodying my invention with the cover plate removed; Y A

Fig. 2 is a fragmentary view partly in section showing the turret with the loopers and loop spreaders thereon and also illus- 'line 8 3, Fig. 2;

the

trating the cam device for operating the looper and loop spreaders;

Fig.- 3 is a section on substantially the Fig/1 is a sectionl `on substantially the line 4 4,Fig.2; 7 Fig. 5 is a sec-tion on the line 5 5, Fig. 2; F ig. 6 is va ysection on the line 6 6, Fig. 3;

Fig. 7 `is a section on the line 7 7, Fig. 3.

Y In the drawings 1 indicates' the bed frame oi: a sewing-machine on whichis mounted theusual head 2, the latter having mounted therein the usual VVertically-reoiprocating needle bar 3 which carries the needle 4 that penetrates' the work from above, the work being held-in the usual worlcclamps 5.

The needle bar 3 is actuated `from a driving .or sewing shaft 6 by anysuitable or usual mechanism not Vsho-wn). be made to United States A The yloopers which co-Operate with the needle in concatenating the thread are situated beneath the bed plate l1 and are mounted on a turret 7 as usual in sewing machines of this type, said turret being supported in suitable bearings8 and being rotatable about a vertical axis so as vtofcarry the stitching around the ends of the buttonho-le or around the eyelet. The turret is turned in the usual way through the medium of a verticallyV arranged rock shaft!) which is provided at its lower end with a gear sector 10, the teeth of which mesh with a gear 11 formed on the turret. This rock vshaft alsoy rotates .the `needle bar sychronously-with the turret, this .being accomplished by another gear sector V12 fast on the rock shaft which meshes with a'gear 13 carried by the needle bar mechanism.

iThe Vrockshaft 9 is turned through the medium of amainoain, not shown, which is situated in the cam housing 14C, this being` a In order to give an understanding of thev common and' usual construction in sewing inachinesoi' this type, it being understood that thev turret will-make a half rotation at each end ot the buttonhole.

The turret 7l carries the usual throat plate ,15 f having asewing opening therethrough through which the needle operates.

f AThe two loopers which co-operate with Y. the needle-are shown at 16 and 17 respectively, each-looper'having associated with it a loop -spreader forq spreadingthe loop of needle thread. These loop spreaders are inlun dicated at 18 and 19 respectively'. The two loopers 16 and k17 are of .usualconstruction and are carried by an oscillatory looper carrier 20 in the form of a block pivoted to the turret at 21, the oscillation of the looper carrier causing first one looper and then the other to tal-:e a loop yof needle thread and hold said loop in position to receive the needle on the next 1penetrating thrust. Y

The 'loop spreaders 18 vand 19 ,are pivotally mounted on thev looper carrier 2O as usual in devices of `this type,each spreader having a shank `22 which; is journalled in a bearing onthe looper carrier. Each spreader is acted on by a spring23 which normally tends to hold it in alignment with the looper. Each spreader is swung away lfrom the corresponding looper to spread the loop of needlethreadby means of a Aspreader actuator 24 which is also pivoted on Vthe turret co-axially withthe looper `carrier and is provided with two arms 25that co-operate with the tails .of the spreaders to give them their spreading movement.

relates to noval means for giving the looper carrier 2O and the spreader actuator 24- their oscillating movements According to the present invention these parts receive their oscillationsfrom a cam member 26 which is situated beneath the turret and is mounted on a horizontal shaft 27 that is; driven from the shaft6. The shaft 27 is journalled in y'suitable bearings 28 and 29 which are car-4 ried by bearing brackets 290 and '291, and said shaft has thereon a bevelled gear 3() which meshes with a bevelled gear 31 on a vertical shaft 32, said shaft having on its upper end a bevelled gear 33 which meshes with and is driven by a bevelled gear 34 carriedvby the sewing shaft 6. The lower end of the vertical shaft 32Vis shown as journalled in suitable bearings 35 carried by the bearing bracket 290. The cam member 26 is thus geared to the sewing shaft 6 so that itrotates in timed relation therewith. This cam member 26 has ,on one face a camgroove 36 by which the looper carrier 20 is actuated and on its other face a cam groove 37 by which the spreader ,actuator is actuated.

The' looper carrier .has rigid. therewith an arm 38 to the Yend of which is` pivotal-ly connected a verticallyfextending connection 39, the latter having a shank portion 40 that Vextends throughan .axial bore 41 Vformed on theturret; 'This vshank 40 Yis ,conlnected atjitsilower endjto va cam-acta-latedv arm 42lthat is pivoted to the vframe at 43, said arm having a lateral projection 44 carand-socket connection being situated in the :axial line of the turret.

The end of the shank 40 is shown `as hav ing. a ball A46 which is receivedin a socket 47, -tlie latter being formed partially in the end of thearm 42 and `partially in a removablecap 48 secured to the arm. As this balland-socket connection isl in the axial line .of .theturret, the turning moven'ient of C:

the latterwill in no wise `effect the operation ofthe device.

is statedr above the spreader actuator 24 actuated by the-camvgroove 37 inthe cam device 26 andfcr this purpose said spreader .actua-tor is provided with an arm 49 to which is connected a` link or connection 50, .the latter A,extendingdown 'through the axial opening 41 lof the turret and also through an opening 51 formed in the ball 46 as l shown lin Figs. 6 and 7. The lower end of this `connection l is provided with a ball '52 which is received in a socket53 formed partially in Ythe end of an arm 54 and partiallyina cap 55 which is removably secured Vto the arm. The arm 54 is one arm of a forked member 56 which is `pvotally mounted on a stud 57 carried by the frame. This forked member 5'6 `embraces the -cam 26 and the other arm 58 thereof extends in the rear of the ca-m Adevice and is provided with a roll59 which enters and operates in the cam groove 37. .l/.Vith this construction the cam groove v37 will operate to swing the forked `arm 56 up and down 'andi such movement will'be communicated through the connec- ..-tion 50 tothe looper spreader thereby giving lit .its required movement.

The ball-and-socket connection 52, 537 is situated .inthe axial line of t-he turrent and thus the rotating movement of the turret '.justed to bring the actionof the loopers into proper timed relationwith the action of the needle. For this purpose the cam is loosely mounted on the shaft 27 .and is adjustably secured to a collar 60 which is rigid with said shaft. This Collar 60 is received in a recess 61' formed inone face of the cam and the` cam isfconnected to the collar by means of screws 62 which screw into the collar spreader is 'and extend through a slot 63 formed in the cam. By loosening the screws 62 the cam may be turned relative to the shaft 27 theretightened the cam will be retained in its adj usted position.

In order to give the loopers their proper movement the cam groove 36 is more or less irregular. `W ith the construction herein shown the cam-actuated parts which have the irregular movement are simply those between the arm i2 and the looper carrier. IIhese parts are relatively light and can, therefore, be given the required irregular motion at a high speed without subjecting the parts to undue strain or produce undesirable jar or vibration. The same is also true of the parts by which the looper actuated.

The connection 39, l0 for operating the looper carrier is preferably made adjustable as to its length so as to provide for bodily adjustment of the looper carrier. A s shown the member 39 is provided at its lower end with a hub through which the upper end of the shank 40 extends, the hub being adjustable vertically on the shaft and held in adjusted position by the screw 72. The connection '50 is also preferably adjustable and for this purpose it is made in two parts, an upper tubular part 73 and a lower stem 74. The upper telescopes into the lower end of the tubular part 73 and the two are secured together in adjustable positions by screws 75.

70 and 7l designate thread guides for the lower thread t in case a lower thread is used. 70 is an arm having a guide eye situated in the axial line of the turret and 7l is a thread-guiding tube carried by the turret and through which the thread extends and by which it is protected as the turret turns about its vertical aXis. After the thread leaves the thread-guiding tube 7l it passes to the usual tension 76 and thence in usual way to one of the loopers.

l/hile I have illustrated herein a selected embodiment ofthe invention I do not wish to be limited to the constructional features shown.

I claim zn l. In a sewing machine, thecombination with a needle, of a sewing shaft by which the needle is operated, a turret, a looper carrier pivotally mounted on the turret, two loopers mounted on said looper carrier.. loop spreaders also mounted on said car 1ier,'a spreader actuator carried by the turret, and a cam device situated beneath the turret for oscillating the looper carrier and the spreader actuator. Y

2. In a sewing machine, the combination with a needle, of a sewing shaft by which end of the stem 4 spreader actuator,

the needle isoperated, a turret, a looper carrier pivotallyl mounted on the turret, two loopers mounted on said looper carrier, lo-op spreaders also mounted on said carrier, a-spreader actuator carried by the turret,.a cam device situated beneath the turret for oscillating the looper carrier and the spreader actuator, and operative connections from the cam to both the looper carrier and spreader actuator.

3. In a sewing machine, the combination with a needle, of a sewing shaft by which the needle is operated, a turret, a `looper carrier pivotally mounted thereon, loopers and loop spreaders on the looper carrier, a spreader actuator, a cam device situated beneath the turret and geared to the sewing shaft, said cam having two cam grooves, operative connections between one cam groove Vand the looper carrier, and other operative connections between the other cam groove and the spreader actuator. j

4:. In a sewing machine, the combination with a needle, of a sewing shaft by which the needle is operated, a turret turnable about a vertical axis, oscillating vloopers mounted on the turret, a cam device situated beneath the turret, gearing connecting said cam with the sewing shaft, a pivoted cam-actuated arm, and connectionsA between said arm and loopers by which the latter are oscillated, said connections permitting turning movement of the turret.

5. In a sewing machine, the combination with a needle, of a sewing shaft by which the needle is operated, a turret turnable about a vertical aXis, oscillating loopers mounted on said turret, loop spreaders cooperating with the loopers, a. cam device situated beneath the turret, gearing connecting said cam device with the sewing shaft, two pivoted arms bothactuatcd by said cam device, operative connections between one of said arms and the loopers, and

means for actuating the loop spreaders from the other arm.

6. In a sewing machine, the combination with a needle operating from above the work, of a sewing shaft from which the needle is operated, a turret situated beneath the work and turnable about a vertical axis, oscillating loopers mounted o-n the turret, loop spreaders co-operating with the loopers.l a

a cam device situated beneath the turret, two pivoted arms actuated by said cam device, and operative connections between one arm and the loopers and operative connections between the other arm and the spreader actuator.

7. In a sewing machine, the combination l with a needle operating from above the work, of a sewing shaft by which the needle is actuated, a turret situated beneath the work, a looper carrier mounted on the turret, loopers on said looper carrier, loop spreadlil() lll) ers (3o-operating With the loopers, an oscillatng spreader actuator also carried bythe turret, t cam device beneath the turret havtwov cum paths, two pvoted arms, one actuated by each path, .a link connecting one arm to the loopexL carrier, and a link con` meeting the other armto the spreader act-uline of the turret. l0

In, testimony whereof, I have signed my `name to this Specification.

Y JOHN KIEVICYZ. 

